Fri, 15 Apr 2016 12:02:37 +0530
8055530: assert(_exits.control()->is_top() || !_gvn.type(ret_phi)->empty()) failed: return value must be well defined
Summary: concurrent class loading causes return phi to become top
Reviewed-by: kvn
1 /*
2 * Copyright (c) 1999, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 #include "precompiled.hpp"
26 #include "opto/c2compiler.hpp"
27 #include "opto/runtime.hpp"
28 #if defined AD_MD_HPP
29 # include AD_MD_HPP
30 #elif defined TARGET_ARCH_MODEL_x86_32
31 # include "adfiles/ad_x86_32.hpp"
32 #elif defined TARGET_ARCH_MODEL_x86_64
33 # include "adfiles/ad_x86_64.hpp"
34 #elif defined TARGET_ARCH_MODEL_sparc
35 # include "adfiles/ad_sparc.hpp"
36 #elif defined TARGET_ARCH_MODEL_zero
37 # include "adfiles/ad_zero.hpp"
38 #elif defined TARGET_ARCH_MODEL_ppc_64
39 # include "adfiles/ad_ppc_64.hpp"
40 #endif
42 // register information defined by ADLC
43 extern const char register_save_policy[];
44 extern const int register_save_type[];
46 const char* C2Compiler::retry_no_subsuming_loads() {
47 return "retry without subsuming loads";
48 }
49 const char* C2Compiler::retry_no_escape_analysis() {
50 return "retry without escape analysis";
51 }
52 const char* C2Compiler::retry_class_loading_during_parsing() {
53 return "retry class loading during parsing";
54 }
55 bool C2Compiler::init_c2_runtime() {
57 // Check assumptions used while running ADLC
58 Compile::adlc_verification();
59 assert(REG_COUNT <= ConcreteRegisterImpl::number_of_registers, "incompatible register counts");
61 for (int i = 0; i < ConcreteRegisterImpl::number_of_registers ; i++ ) {
62 OptoReg::vm2opto[i] = OptoReg::Bad;
63 }
65 for( OptoReg::Name i=OptoReg::Name(0); i<OptoReg::Name(REG_COUNT); i = OptoReg::add(i,1) ) {
66 VMReg r = OptoReg::as_VMReg(i);
67 if (r->is_valid()) {
68 OptoReg::vm2opto[r->value()] = i;
69 }
70 }
72 // Check that runtime and architecture description agree on callee-saved-floats
73 bool callee_saved_floats = false;
74 for( OptoReg::Name i=OptoReg::Name(0); i<OptoReg::Name(_last_Mach_Reg); i = OptoReg::add(i,1) ) {
75 // Is there a callee-saved float or double?
76 if( register_save_policy[i] == 'E' /* callee-saved */ &&
77 (register_save_type[i] == Op_RegF || register_save_type[i] == Op_RegD) ) {
78 callee_saved_floats = true;
79 }
80 }
82 DEBUG_ONLY( Node::init_NodeProperty(); )
84 Compile::pd_compiler2_init();
86 CompilerThread* thread = CompilerThread::current();
88 HandleMark handle_mark(thread);
89 return OptoRuntime::generate(thread->env());
90 }
93 void C2Compiler::initialize() {
94 // The first compiler thread that gets here will initialize the
95 // small amount of global state (and runtime stubs) that C2 needs.
97 // There is a race possible once at startup and then we're fine
99 // Note that this is being called from a compiler thread not the
100 // main startup thread.
101 if (should_perform_init()) {
102 bool successful = C2Compiler::init_c2_runtime();
103 int new_state = (successful) ? initialized : failed;
104 set_state(new_state);
105 }
106 }
108 void C2Compiler::compile_method(ciEnv* env, ciMethod* target, int entry_bci) {
109 assert(is_initialized(), "Compiler thread must be initialized");
111 bool subsume_loads = SubsumeLoads;
112 bool do_escape_analysis = DoEscapeAnalysis && !env->jvmti_can_access_local_variables();
113 bool eliminate_boxing = EliminateAutoBox;
114 while (!env->failing()) {
115 // Attempt to compile while subsuming loads into machine instructions.
116 Compile C(env, this, target, entry_bci, subsume_loads, do_escape_analysis, eliminate_boxing);
119 // Check result and retry if appropriate.
120 if (C.failure_reason() != NULL) {
121 if (C.failure_reason_is(retry_class_loading_during_parsing())) {
122 env->record_failure(C.failure_reason());
123 continue; // retry
124 }
125 if (C.failure_reason_is(retry_no_subsuming_loads())) {
126 assert(subsume_loads, "must make progress");
127 subsume_loads = false;
128 continue; // retry
129 }
130 if (C.failure_reason_is(retry_no_escape_analysis())) {
131 assert(do_escape_analysis, "must make progress");
132 do_escape_analysis = false;
133 continue; // retry
134 }
135 if (C.has_boxed_value()) {
136 // Recompile without boxing elimination regardless failure reason.
137 assert(eliminate_boxing, "must make progress");
138 eliminate_boxing = false;
139 continue; // retry
140 }
141 // Pass any other failure reason up to the ciEnv.
142 // Note that serious, irreversible failures are already logged
143 // on the ciEnv via env->record_method_not_compilable().
144 env->record_failure(C.failure_reason());
145 }
146 if (StressRecompilation) {
147 if (subsume_loads) {
148 subsume_loads = false;
149 continue; // retry
150 }
151 if (do_escape_analysis) {
152 do_escape_analysis = false;
153 continue; // retry
154 }
155 }
157 // No retry; just break the loop.
158 break;
159 }
160 }
163 void C2Compiler::print_timers() {
164 // do nothing
165 }